CN213876157U - Optical imaging system, image capturing device and electronic device - Google Patents

Abstract

The utility model provides an optical imaging system includes along the optical axis by thing side to picture side in proper order: a prism; a diaphragm; a first lens having a positive refracting power, an object-side surface of the first lens being convex at a paraxial region; a second lens having a bending force; a third lens having a bending force; a fourth lens having a bending force; a fifth lens having a bending force; and a sixth lens having a bending force; the optical imaging system satisfies the following relation: f IMGH/Y62 is not less than 10 and not more than 25. The optical imaging system can enable the electronic device loaded with the optical imaging system to meet the design of light weight and thinness; moreover, the design of a large aperture is adopted, the bending force is reasonably distributed, the long-focus function can be realized, and the optical imaging system has lower optical performance sensitivity and better imaging quality; in addition, the long focal length and the miniaturization can be balanced, a large imaging surface and a large light receiving area are ensured, and the integral imaging brightness is improved. The utility model discloses provide a get for instance device and electron device simultaneously.

Description

Optical imaging system, image capturing device and electronic device

Technical Field

The utility model relates to an optical imaging technical field especially relates to an optical imaging system, get for instance device and electron device.

Background

In recent years, various long focal length lenses that highlight a main imaging object with a shallow depth of field and match a high-pixel small-sized chip have been developed in succession in order to capture a distant scene.

In the process of implementing the present invention, the inventor finds that there are at least the following problems in the prior art: the existing three-piece, four-piece and five-piece lenses all reach the corresponding technical bottlenecks, and the total length of the lens can be increased for obtaining higher image definition based on the same photosensitive chip, so that the lightness and thinness of the lens are restricted.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide an optical imaging system, an image capturing device and an electronic device to solve the above problems.

An embodiment of the present application provides an optical imaging system, sequentially from an object side to an image side along an optical axis, comprising:

a prism;

a diaphragm;

a first lens having a positive refracting power, an object-side surface of the first lens being convex at a paraxial region;

a second lens having a bending force;

a third lens having a bending force;

a fourth lens having a bending force;

a fifth lens having a bending force; and

a sixth lens having a bending force;

the optical imaging system satisfies the following relation:

10≤f*IMGH/Y62≤25；

wherein f is an effective focal length of the optical imaging system, IMGH is a half of a maximum field angle corresponding image height of the optical imaging system, and Y62 is a maximum effective half aperture of an image side surface of the sixth lens.

The optical imaging system deflects the light path by ninety degrees through the isosceles right-angle prism, so that the thickness of the optical imaging system is reduced, and an electronic device loaded with the optical imaging system meets the light and thin design; moreover, the design of a large aperture is adopted, the bending force is reasonably distributed, the long-focus function can be realized, and the optical imaging system has lower optical performance sensitivity and better imaging quality; in addition, the long focal length and the miniaturization can be balanced, a large imaging surface and a large light receiving area are ensured, and the integral imaging brightness is improved.

In some embodiments, the optical imaging system satisfies the following relationship:

1≤EPD/Y62≤3；

and EPD is the diameter of an entrance pupil of the optical imaging system, and Y62 is the maximum effective half aperture of the image side surface of the sixth lens.

Therefore, the light flux amount can be balanced, the miniaturization can be realized, and the imaging quality can be improved.

In some embodiments, the optical imaging system satisfies the following conditional expression:

1≤∑CT/T14≤2；

where Σ CT is the sum of thicknesses of all lenses of the optical imaging system on the optical axis, and T14 is the sum of thicknesses of the first lens, the second lens, the third lens, and the fourth lens on the optical axis.

So, through rationally arranging lens spatial position, let the light transition more gentle to can correct optical imaging system's curvature of field, balance chromatic dispersion and long focal characteristic.

In some embodiments, the optical imaging system satisfies the following conditional expression:

3mm^-1≤MVd/f≤6mm^-1；

wherein, MVd is the average value of Abbe numbers of the six lenses, and f is the effective focal length of the optical imaging system.

Therefore, chromatic aberration can be balanced, the high Abbe number and the low Abbe number correspond to different refractive indexes, the long-focus function can be realized through different material combinations, and the optical imaging performance is improved.

In some embodiments, the optical imaging system satisfies the following conditional expression:

1°/mm≤FOV/f≤6°/mm；

wherein FOV is the maximum field angle of the optical imaging system, and f is the effective focal length of the optical imaging system.

Therefore, the field angle can be controlled within a certain range, the effective focal length reaches the long-focus distance, and the telephoto function is realized.

In some embodiments, the optical imaging system satisfies the following conditional expression:

0≤TL/f≤1；

wherein TL is a distance on an optical axis from an object-side surface of the first lens element to an image plane of the optical imaging system, and f is an effective focal length of the optical imaging system.

Thus, miniaturization and a long-focus characteristic can be balanced.

In some embodiments, the optical imaging system satisfies the following conditional expression:

1≤f/f1≤3；

wherein f is an effective focal length of the optical imaging system, and f1 is an effective focal length of the first lens.

Therefore, the bending force of the first lens can be in a reasonable interval, and the yield of the first lens forming process is improved; meanwhile, the bending force of the first lens occupies a proper proportion in the whole bending force of the optical imaging system, and stable transition of light rays is facilitated.

In some embodiments, the optical imaging system satisfies the following conditional expression:

0≤|SAG32|/CT34≤1；

SAG32 is a displacement of the maximum effective radius position of the image-side surface of the third lens from the intersection point of the image-side surface of the third lens on the optical axis to the image-side surface of the third lens in the optical axis direction, and CT34 is a distance between the image-side surface of the third lens and the object-side surface of the fourth lens on the optical axis.

Therefore, through the reasonable layout of the optical structure, the direction change of light rays entering the optical imaging system can be slowed down, the intensity of stray light is favorably reduced, the optical performance sensitivity of the optical imaging system is reduced, and the yield of third lenses is improved.

In some embodiments, the optical imaging system satisfies the following conditional expression:

0≤|SAG41|/CT34≤1；

SAG41 is a displacement of the maximum effective radius position of the object-side surface of the fourth lens from the intersection point of the object-side surface of the fourth lens on the optical axis to the object-side surface of the fourth lens in the optical axis direction, and CT34 is a distance between the image-side surface of the third lens and the object-side surface of the fourth lens on the optical axis.

Therefore, through the reasonable layout of the optical structure, the direction change of light rays entering the optical imaging system can be slowed down, the ghost image intensity is reduced, the optical performance sensitivity of the optical imaging system is reduced, and the yield of the fourth lens is improved.

In some embodiments, the optical imaging system satisfies the following conditional expression:

0≤MINL5/MAXL5≤1；

wherein MINL5 is the minimum thickness of the fifth lens in the effective area, and MAXL5 is the maximum thickness of the fifth lens in the effective area.

Therefore, the thickness ratio of the fifth lens is in a proper interval, and the forming process yield of the fifth lens is improved; meanwhile, the aberration of the fifth lens is maintained in a reasonable range, which is beneficial to eliminating the integral aberration of the optical imaging system.

An embodiment of the present application provides an image capturing apparatus, including:

the optical imaging system described above; and

and the photosensitive element is arranged on an imaging surface of the optical imaging system.

In the image capturing device, the optical imaging system deflects the light path by ninety degrees through the isosceles right-angle prism, so that the thickness of the optical imaging system is reduced, and the electronic device loaded with the optical imaging system meets the light and thin design; moreover, the design of a large aperture is adopted, the bending force is reasonably distributed, the long-focus function can be realized, and the optical imaging system has lower optical performance sensitivity and better imaging quality; in addition, the long focal length and the miniaturization can be balanced, the large light receiving area of the large imaging surface is guaranteed, and the integral brightness of imaging is improved.

An embodiment of the present application provides an electronic device, including:

a housing; and

the image capturing device is mounted in the housing to acquire an image.

The image side surface of the first lens is glued with the object side surface of the second lens to form a cemented lens.

In the image capturing device, the optical imaging system deflects the light path by ninety degrees through the isosceles right-angle prism, so that the thickness of the optical imaging system is reduced, and the electronic device loaded with the optical imaging system meets the light and thin design; moreover, the design of a large aperture is adopted, the bending force is reasonably distributed, the long-focus function can be realized, and the optical imaging system has lower optical performance sensitivity and better imaging quality; in addition, the long focal length and the miniaturization can be balanced, the large light receiving area of the large imaging surface is guaranteed, and the integral brightness of imaging is improved.

Additional aspects and advantages of embodiments of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of an optical imaging system according to a first embodiment of the present invention.

Fig. 2 is a schematic view of spherical aberration, astigmatism and distortion according to a first embodiment of the present invention.

Fig. 3 is a schematic structural diagram of an optical imaging system according to a second embodiment of the present invention.

Fig. 4 is a schematic diagram of spherical aberration, astigmatism and distortion according to a second embodiment of the present invention.

Fig. 5 is a schematic structural diagram of an optical imaging system according to a third embodiment of the present invention.

Fig. 6 is a schematic view of spherical aberration, astigmatism and distortion according to a third embodiment of the present invention.

Fig. 7 is a schematic structural diagram of an optical imaging system according to a fourth embodiment of the present invention.

Fig. 8 is a schematic view of spherical aberration, astigmatism and distortion according to a fourth embodiment of the present invention.

Fig. 9 is a schematic structural diagram of an optical imaging system according to a fifth embodiment of the present invention.

Fig. 10 is a schematic view of spherical aberration, astigmatism and distortion of a fifth embodiment of the present invention.

Fig. 11 is a schematic structural diagram of an optical imaging system according to a sixth embodiment of the present invention.

Fig. 12 is a schematic view of spherical aberration, astigmatism and distortion according to a sixth embodiment of the present invention.

Fig. 13 is a schematic structural diagram of an optical imaging system according to a seventh embodiment of the present invention.

Fig. 14 is a schematic view of spherical aberration, astigmatism and distortion according to a seventh embodiment of the present invention.

Fig. 15 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

Description of the main elements

Electronic device 1000

Image capturing device 100

Optical imaging system 10

Isosceles right angle prism L0

First lens L1

Second lens L2

Third lens L3

Fourth lens L4

Fifth lens L5

Sixth lens L6

Infrared filter L7

Stop STO

Object sides S4, S6, S8, S10, S12, S14, S16

Like sides S5, S7, S9, S11, S13, S15, S17

Image forming surface S18

Photosensitive element 20

Housing 200

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

Referring to fig. 1, the optical imaging system 10 of the embodiment of the present invention includes, in order along an optical axis LA from an object side to an image side, an isosceles right prism L0, a stop STO, a first lens L1 with positive bending force, a second lens L2 with bending force, a third lens L3 with bending force, a fourth lens L4 with bending force, a fifth lens L5 with bending force, and a sixth lens L6 with bending force, wherein the optical axis LA is substantially L-shaped.

The isosceles right prism L0 has sides S1, S2, S3, the first lens L1 has an object side S4 and an image side S5, the second lens L2 has an object side S6 and an image side S7, the third lens L3 has an object side S8 and an image side S9, the fourth lens L4 has an object side S10 and an image side S11, the fifth lens L5 has an object side S12 and an image side S13, and the sixth lens L6 has an object side S14 and an image side S15, wherein the object side S4 of the first lens L1 is convex at the paraxial region.

During imaging, light incident from the outside enters the side surface S1 of the isosceles right prism L0 along the optical axis LA, is deflected and turned by the isosceles right prism L0, exits from the side surface S3 of the isosceles right prism L0, passes through the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 in this order along the optical axis, and reaches the imaging surface S18.

The optical imaging system 10 satisfies the following conditional expressions:

10≤f*IMGH/Y62≤25；

where f is the effective focal length of the optical imaging system 10, IMGH is half of the maximum field angle corresponding image height of the optical imaging system 10, and Y62 is the maximum effective half aperture of the image-side surface S12 of the sixth lens L6.

The optical imaging system 10 deflects the optical path by ninety degrees through the isosceles right prism L0, so as to reduce the thickness of the optical imaging system 10, and make the electronic device loaded with the optical imaging system 10 satisfy the design of being light and thin; and the design of a large aperture is adopted, the bending force is reasonably distributed, the long-focus function can be realized, and the optical imaging system 10 has lower optical performance sensitivity and better imaging quality.

In some embodiments, the optical imaging system 10 satisfies the following conditional expressions: 10.183 ≤ f × IMGH/Y62 ≤ 21.095. So, can balance longer focus and miniaturization, guarantee that great imaging surface satisfies great receipts light area, promote the whole luminance of formation of image. However, when the above conditional expression range is exceeded, or the focal length of the optical imaging system 10 is long, the volume is large; or the optical imaging system 10 has a short focal length and a small size, and it cannot be ensured that a large imaging surface can satisfy a large light receiving area.

In some embodiments, optical imaging system 10 further includes an infrared filter L7, infrared filter L7 having an object side S16 and an image side S17. The infrared filter L7 is disposed on the image-side surface S15 of the sixth lens element L6 to filter out light in other wavelength bands, such as visible light, and only let infrared light pass through, so that the optical imaging system 10 can also image in a dark environment and other special application scenarios.

In some embodiments, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all made of plastic, and in this case, the plastic lens can reduce the weight of the optical imaging system 10 and reduce the production cost. In some embodiments, the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4, the fifth lens element L5 and the sixth lens element L6 are made of glass, so that the optical imaging system 10 can endure higher temperature and has better optical performance. In other embodiments, only the first lens L1 may be made of glass, and the other lenses are made of plastic, in which case, the first lens L1 closest to the object side can better withstand the influence of the ambient temperature on the object side, and the production cost of the optical imaging system 10 is kept low because the other lenses are made of plastic. In other embodiments, the material of the first lens L1 is glass, and the materials of the other lenses can be combined arbitrarily.

In some embodiments, the optical imaging system 10 satisfies the following relationship:

1≤EPD/Y62≤3；

where EPD is the entrance pupil diameter of the optical imaging system 10, and Y62 is the maximum effective half aperture of the image-side surface S15 of the sixth lens L6.

In some embodiments, the optical imaging system 10 satisfies the following conditional expressions: 1.443 < EPD/Y62 < 2.329. Therefore, the light flux amount can be balanced, the miniaturization can be realized, and the imaging quality can be improved. However, when the above conditional expression range is exceeded, the light flux amount and the miniaturization of the optical imaging system 10 cannot be effectively balanced, and the imaging quality is poor.

In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:

1≤∑CT/T14≤2；

where Σ CT is the sum of the thicknesses of all the lenses of the optical imaging system 10 on the optical axis, and T14 is the sum of the thicknesses of the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 on the optical axis.

In some embodiments, the optical imaging system 10 satisfies the following conditional expressions: and sigma CT/T14 is more than or equal to 1.266 and less than or equal to 1.563. Therefore, the light ray transition is more gentle by reasonably arranging the space positions of the lenses, the field curvature of the optical imaging system 10 can be corrected, and the chromatic dispersion and the long-focus characteristics are balanced. However, when the above conditional expression range is exceeded, the dispersion and the telephoto characteristics of the optical imaging system 10 cannot be effectively balanced.

In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:

3mm^-1≤MVd/f≤6mm^-1；

where MVd is an average value of abbe numbers of the six lenses L6, and f is an effective focal length of the optical imaging system 10.

Further, in some embodiments, 3.599mm^-1≤MVd/f≤5.919mm^-1. Therefore, chromatic aberration can be balanced, the high Abbe number and the low Abbe number correspond to different refractive indexes, the long-focus function can be realized through different material combinations, and the optical imaging performance is improved. However, when the above conditional expression range is exceeded, it is not favorable to realize the telephoto characteristic of the optical imaging system 10, and the optical imaging performance is poor.

In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:

1°/mm≤FOV/f≤6°/mm；

where FOV is the maximum field angle of the optical imaging system 10 and f is the effective focal length of the optical imaging system 10.

Further, in some embodiments, 1.782/mm FOV/f 5.066/mm. Therefore, the field angle can be controlled within a certain range, the effective focal length reaches the long-focus distance, and the telephoto function is realized. However, when the range of the above conditional expression is exceeded, it is not favorable to control the angle of view and implement the telephoto function.

In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:

0≤TL/f≤1；

where TL is an axial distance from the object-side surface S4 of the first lens element L1 to the image plane S18 of the optical imaging system 10, and f is an effective focal length of the optical imaging system 10.

Further, in some embodiments, the optical imaging system 10 satisfies the following conditional expression: TL/f is more than or equal to 0.893 and less than or equal to 0.943. Thus, miniaturization and a long-focus characteristic can be balanced. However, when the range of the above conditional expression is exceeded, the balance between the miniaturization and the char characteristics is not favorable.

In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:

1≤f/f1≤3；

where f is the effective focal length of the optical imaging system 10, and f1 is the effective focal length of the first lens L1.

Further, in some embodiments, the optical imaging system 10 satisfies the following conditional expression: f/f1 is more than or equal to 1.334 and less than or equal to 2.211. Therefore, the bending force of the first lens L1 can be in a reasonable interval, and the yield of the forming process of the first lens L1 is improved; meanwhile, the bending force of the first lens L1 is in a proper proportion in the whole bending force of the optical imaging system 10, which is beneficial to light stable transition. However, when the range of the conditional expressions is exceeded, it is not favorable to improve the yield of the molding process of the first lens L1 and stabilize the light transition.

In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:

0≤|SAG32|/CT34≤1；

the SAG32 is a displacement amount of the optical axis direction from the intersection point of the optical axis of the image-side surface S8 of the third lens L3 to the maximum effective radius position of the image-side surface S9 of the third lens L3, and the CT34 is a distance between the optical axis of the image-side surface S9 of the third lens L3 and the optical axis of the object-side surface S10 of the fourth lens L4.

Further, in some embodiments, the optical imaging system 10 satisfies the following conditional expression: the absolute value of SAG 32/CT 34 is more than or equal to 0.038 and less than or equal to 0.276. Therefore, through the reasonable layout of the optical structure, the direction change of the light entering the optical imaging system 10 can be slowed down, the intensity of the stray light is reduced, the optical performance sensitivity of the optical imaging system is reduced, and the yield of the third lens L3 is improved. However, when the above conditional expression range is exceeded, it is not favorable to slow down the direction change of the light after entering the optical imaging system 10, and the yield of producing the third lens L3 is low.

In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:

0≤|SAG41|/CT34≤1；

SAG41 is a displacement of the maximum effective radius position from the intersection point of the optical axis of the object-side surface S10 of the fourth lens L4 to the object-side surface S10 of the fourth lens L4 in the optical axis direction, and CT34 is a distance between the optical axis of the image-side surface S9 of the third lens L3 and the optical axis of the object-side surface S10 of the fourth lens L4.

Further, in some embodiments, the optical imaging system 10 satisfies the following conditional expression: the total ratio of SAG 41/CT 34 is more than or equal to 0.283 and less than or equal to 0.486. Therefore, through the reasonable layout of the optical structure, the direction change of the light entering the optical imaging system 10 can be slowed down, the ghost image intensity can be reduced, the optical performance sensitivity of the optical imaging system 10 is reduced, and the yield of the fourth lens L4 is improved. However, when the range of the conditional expressions is exceeded, it is not favorable to slow down the direction change of the light after entering the optical imaging system 10, and the yield of producing the fourth lens L4 is low.

In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:

0≤MINL5/MAXL5≤1；

where MINL5 is the minimum thickness of the fifth lens L5 in the effective area, and MAXL5 is the maximum thickness of the fifth lens L5 in the effective area.

Further, in some embodiments, the optical imaging system 10 satisfies the following conditional expression: 0.344 is less than or equal to MINL5/MAXL5 is less than or equal to 0.778. Therefore, the thickness ratio of the fifth lens L5 is within a proper range, and the forming process yield of the fifth lens L5 is improved; meanwhile, the aberration of the fifth lens L5 is maintained within a reasonable range, which is beneficial to eliminating the aberration of the whole optical imaging system 10. However, if the range of the conditional expressions is exceeded, it is not favorable to improve the yield of the molding process of the fifth lens L5 and eliminate the aberration of the whole optical imaging system 10.

First embodiment

With reference to fig. 1, the optical imaging system 10 in the present embodiment includes, from the object side to the image side, an isosceles right prism L0, a stop STO, a first lens L1 with positive bending force, a second lens L2 with positive bending force, a third lens L3 with negative bending force, a fourth lens L4 with negative bending force, a fifth lens L5 with negative bending force, a sixth lens L6 with positive bending force, and an infrared filter L7.

In the present embodiment, the object-side surface S4 of the first lens element L1 is convex at the paraxial region, and the image-side surface S5 of the first lens element L1 is concave at the paraxial region; the object-side surface S6 of the second lens element L2 is convex at the paraxial region, and the image-side surface S7 of the second lens element L2 is convex at the paraxial region; the object-side surface S8 of the third lens element L3 is convex at the paraxial region, the image-side surface S9 of the third lens element L3 is concave at the paraxial region, the object-side surface S10 of the fourth lens element L4 is concave at the paraxial region, and the image-side surface S11 of the fourth lens element L4 is convex at the paraxial region; the object-side surface S12 of the fifth lens element L5 is concave at the paraxial region, and the image-side surface S13 of the fifth lens element L5 is concave at the paraxial region; the object-side surface S14 of the sixth lens element L6 is convex at the paraxial region, and the image-side surface S15 of the sixth lens element L6 is convex at the paraxial region.

The object-side surface S4 of the first lens L1 is convex at the near circumference, and the image-side surface S5 of the first lens L1 is concave at the near circumference; the object-side surface S6 of the second lens L2 is convex at the near circumference, and the image-side surface S7 of the second lens L2 is convex at the near circumference; the object-side surface S8 of the third lens L3 is convex at the near circumference, the image-side surface S9 of the third lens L3 is concave at the near circumference, the object-side surface S10 of the fourth lens L4 is concave at the near circumference, and the image-side surface S11 of the fourth lens L4 is convex at the near circumference; the object-side surface S12 of the fifth lens L5 is concave at the near circumference, and the image-side surface S13 of the fifth lens L5 is convex at the near circumference; the object-side surface S14 of the sixth lens L6 is concave in the near-circumference direction, and the image-side surface S15 of the sixth lens L6 is convex in the near-circumference direction.

Referring to fig. 2, fig. 2 shows a spherical aberration (mm), astigmatism (mm) and a distortion (%) of the optical imaging system 10 according to the first embodiment, wherein the reference wavelengths of the focal length, the abbe number and the refractive index are 587.5618 nm. The optical imaging system 10 in the first embodiment satisfies the conditions of the following table.

Table 1

It should be noted that f is the focal length of the optical imaging system 10, FNO is the f-number of the optical imaging system 10, and FOV is the maximum field angle of the optical imaging system 10.

Table 2

The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all aspheric lenses. The aspherical surface has a surface shape determined by the following formula:

where Z is the longitudinal distance from any point on the aspherical surface to the surface vertex, r is the distance from any point on the aspherical surface to the optical axis, c is the vertex curvature (reciprocal of the radius of curvature), k is a conic constant, and Ai is the correction coefficient of the i-th order of the aspherical surface, and table 2 gives the high-order term coefficients K, A4, a6, a8, a10 … … that can be used for each of the spherical mirror surfaces S4-S15 in example one.

Second embodiment

Referring to fig. 3, the optical imaging system 10 in this embodiment includes, from an object side to an image side, an isosceles right prism L0, a stop STO, a first lens L1 with positive bending force, a second lens L2 with positive bending force, a third lens L3 with negative bending force, a fourth lens L4 with negative bending force, a fifth lens L5 with negative bending force, a sixth lens L6 with negative bending force, and an infrared filter L7.

In the present embodiment, the object-side surface S4 of the first lens element L1 is convex at the paraxial region, and the image-side surface S5 of the first lens element L1 is concave at the paraxial region; the object-side surface S6 of the second lens element L2 is convex at the paraxial region, and the image-side surface S7 of the second lens element L2 is convex at the paraxial region; the object-side surface S8 of the third lens element L3 is convex at the paraxial region, the image-side surface S9 of the third lens element L3 is concave at the paraxial region, the object-side surface S10 of the fourth lens element L4 is concave at the paraxial region, and the image-side surface S11 of the fourth lens element L4 is convex at the paraxial region; the object-side surface S12 of the fifth lens element L5 is convex at the paraxial region, and the image-side surface S13 of the fifth lens element L5 is concave at the paraxial region; the object-side surface S14 of the sixth lens element L6 is convex at the paraxial region, and the image-side surface S15 of the sixth lens element L6 is concave at the paraxial region.

The object-side surface S4 of the first lens L1 is convex at the near circumference, and the image-side surface S5 of the first lens L1 is concave at the near circumference; the object-side surface S6 of the second lens L2 is convex at the near circumference, and the image-side surface S7 of the second lens L2 is concave at the near circumference; the object-side surface S8 of the third lens L3 is convex at the near circumference, the image-side surface S9 of the third lens L3 is concave at the near circumference, the object-side surface S10 of the fourth lens L4 is concave at the near circumference, and the image-side surface S11 of the fourth lens L4 is convex at the near circumference; the object-side surface S12 of the fifth lens L5 is concave at the near circumference, and the image-side surface S13 of the fifth lens L5 is convex at the near circumference; the object-side surface S14 of the sixth lens L6 is concave in the near-circumference direction, and the image-side surface S15 of the sixth lens L6 is convex in the near-circumference direction.

Referring to fig. 4, fig. 4 shows a spherical aberration (mm), astigmatism (mm) and distortion (%) of the optical imaging system 10 in the second embodiment, wherein the reference wavelengths of the focal length, abbe number and refractive index are 587.5618 nm. The optical imaging system 10 in the second embodiment satisfies the conditions of the following table.

Table 3

It should be noted that f is the focal length of the optical imaging system 10, FNO is the f-number of the optical imaging system 10, and FOV is the maximum field angle of the optical imaging system 10.

Table 4

The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all aspheric lenses. The aspherical surface has a surface shape determined by the following formula:

where Z is the longitudinal distance from any point on the aspherical surface to the surface vertex, r is the distance from any point on the aspherical surface to the optical axis, c is the vertex curvature (reciprocal of the radius of curvature), k is a conic constant, and Ai is a correction coefficient of the i-th order of the aspherical surface, and table 4 gives the high-order term coefficients K, A4, a6, a8, a10 … … that can be used for each of the spherical mirror surfaces S4-S15 in example two.

Third embodiment

Referring to fig. 5, the optical imaging system 10 in this embodiment includes, from the object side to the image side, an isosceles right prism L0, a stop STO, a first lens L1 with positive bending force, a second lens L2 with positive bending force, a third lens L3 with negative bending force, a fourth lens L4 with negative bending force, a fifth lens L5 with negative bending force, a sixth lens L6 with positive bending force, and an infrared filter L7.

In the present embodiment, the object-side surface S4 of the first lens element L1 is convex at the paraxial region, and the image-side surface S5 of the first lens element L1 is concave at the paraxial region; the object-side surface S6 of the second lens element L2 is convex at the paraxial region, and the image-side surface S7 of the second lens element L2 is concave at the paraxial region; the object-side surface S8 of the third lens element L3 is concave at the paraxial region, the image-side surface S9 of the third lens element L3 is convex at the paraxial region, the object-side surface S10 of the fourth lens element L4 is concave at the paraxial region, and the image-side surface S11 of the fourth lens element L4 is convex at the paraxial region; the object-side surface S12 of the fifth lens element L5 is concave at the paraxial region, and the image-side surface S13 of the fifth lens element L5 is concave at the paraxial region; the object-side surface S14 of the sixth lens element L6 is convex at the paraxial region, and the image-side surface S15 of the sixth lens element L6 is convex at the paraxial region.

The object-side surface S4 of the first lens L1 is convex at the near circumference, and the image-side surface S5 of the first lens L1 is convex at the near circumference; the object-side surface S6 of the second lens L2 is concave at the near circumference, and the image-side surface S7 of the second lens L2 is convex at the near circumference; the object-side surface S8 of the third lens L3 is convex at the near circumference, the image-side surface S9 of the third lens L3 is concave at the near circumference, the object-side surface S10 of the fourth lens L4 is concave at the near circumference, and the image-side surface S11 of the fourth lens L4 is convex at the near circumference; the object-side surface S12 of the fifth lens L5 is concave at the near circumference, and the image-side surface S13 of the fifth lens L5 is convex at the near circumference; the object-side surface S14 of the sixth lens L6 is concave in the near-circumference direction, and the image-side surface S15 of the sixth lens L6 is convex in the near-circumference direction.

Referring to fig. 6, fig. 6 shows a spherical aberration (mm), astigmatism (mm) and a distortion (%) of the optical imaging system 10 according to the third embodiment, wherein the reference wavelengths of the focal length, the abbe number and the refractive index are 587.5618 nm. The optical imaging system 10 in the third embodiment satisfies the conditions of the following table.

Table 5

It should be noted that f is the focal length of the optical imaging system 10, FNO is the f-number of the optical imaging system 10, and FOV is the maximum field angle of the optical imaging system 10.

Table 6

The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all aspheric lenses. The aspherical surface has a surface shape determined by the following formula:

where Z is the longitudinal distance from any point on the aspherical surface to the surface vertex, r is the distance from any point on the aspherical surface to the optical axis, c is the vertex curvature (reciprocal of the radius of curvature), k is a conic constant, and Ai is a correction coefficient of the i-th order of the aspherical surface, and table 6 gives the high-order term coefficients K, A4, a6, a8, a10 … … that can be used for each of the spherical mirror surfaces S4-S15 in example three.

Fourth embodiment

Referring to fig. 7, the optical imaging system 10 in this embodiment includes, from the object side to the image side, an isosceles right prism L0, a stop STO, a first lens L1 with positive bending force, a second lens L2 with positive bending force, a third lens L3 with negative bending force, a fourth lens L4 with positive bending force, a fifth lens L5 with negative bending force, a sixth lens L6 with positive bending force, and an infrared filter L7.

In the present embodiment, the object-side surface S4 of the first lens element L1 is convex at the paraxial region, and the image-side surface S5 of the first lens element L1 is concave at the paraxial region; the object-side surface S6 of the second lens element L2 is convex at the paraxial region, and the image-side surface S7 of the second lens element L2 is convex at the paraxial region; the object-side surface S8 of the third lens element L3 is convex at the paraxial region, the image-side surface S9 of the third lens element L3 is concave at the paraxial region, the object-side surface S10 of the fourth lens element L4 is concave at the paraxial region, and the image-side surface S11 of the fourth lens element L4 is convex at the paraxial region; the object-side surface S12 of the fifth lens element L5 is concave at the paraxial region, and the image-side surface S13 of the fifth lens element L5 is concave at the paraxial region; the object-side surface S14 of the sixth lens element L6 is concave at the paraxial region, and the image-side surface S15 of the sixth lens element L6 is convex at the paraxial region.

The object-side surface S4 of the first lens L1 is convex at the near circumference, and the image-side surface S5 of the first lens L1 is concave at the near circumference; the object-side surface S6 of the second lens L2 is convex at the near circumference, and the image-side surface S7 of the second lens L2 is concave at the near circumference; the object-side surface S8 of the third lens L3 is convex at the near circumference, the image-side surface S9 of the third lens L3 is concave at the near circumference, the object-side surface S10 of the fourth lens L4 is concave at the near circumference, and the image-side surface S11 of the fourth lens L4 is convex at the near circumference; the object-side surface S12 of the fifth lens L5 is concave at the near circumference, and the image-side surface S13 of the fifth lens L5 is convex at the near circumference; the object-side surface S14 of the sixth lens L6 is concave in the near-circumference direction, and the image-side surface S15 of the sixth lens L6 is convex in the near-circumference direction.

Referring to fig. 8, fig. 8 shows a spherical aberration (mm), astigmatism (mm) and distortion (%) of the optical imaging system 10 according to the fourth embodiment, wherein the reference wavelengths of the focal length, abbe number and refractive index are 587.5618 nm. The optical imaging system 10 in the fourth embodiment satisfies the conditions of the following table.

Table 7

It should be noted that f is the focal length of the optical imaging system 10, FNO is the f-number of the optical imaging system 10, and FOV is the maximum field angle of the optical imaging system 10.

Table 8

The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all aspheric lenses. The aspherical surface has a surface shape determined by the following formula:

where Z is the longitudinal distance from any point on the aspherical surface to the surface vertex, r is the distance from any point on the aspherical surface to the optical axis, c is the vertex curvature (reciprocal of the radius of curvature), k is a conic constant, and Ai is a correction coefficient of the i-th order of the aspherical surface, and table 8 gives the high-order term coefficients K, A4, a6, a8, a10 … … that can be used for each of the spherical mirror surfaces S4-S15 in the fourth embodiment.

Fifth embodiment

Referring to fig. 9, the optical imaging system 10 of the present embodiment includes, from an object side to an image side, an isosceles right prism L0, a stop STO, a first lens L1 with positive bending force, a second lens L2 with positive bending force, a third lens L3 with negative bending force, a fourth lens L4 with positive bending force, a fifth lens L5 with negative bending force, a sixth lens L6 with positive bending force, and an infrared filter L7.

In the present embodiment, the object-side surface S4 of the first lens element L1 is convex at the paraxial region, and the image-side surface S5 of the first lens element L1 is convex at the paraxial region; the object-side surface S6 of the second lens element L2 is concave at the paraxial region, and the image-side surface S7 of the second lens element L2 is convex at the paraxial region; the object-side surface S8 of the third lens element L3 is convex at the paraxial region, the image-side surface S9 of the third lens element L3 is concave at the paraxial region, the object-side surface S10 of the fourth lens element L4 is concave at the paraxial region, and the image-side surface S11 of the fourth lens element L4 is convex at the paraxial region; the object-side surface S12 of the fifth lens element L5 is concave at the paraxial region, and the image-side surface S13 of the fifth lens element L5 is concave at the paraxial region; the object-side surface S14 of the sixth lens element L6 is convex at the paraxial region, and the image-side surface S15 of the sixth lens element L6 is convex at the paraxial region.

The object-side surface S4 of the first lens L1 is convex at the near circumference, and the image-side surface S5 of the first lens L1 is concave at the near circumference; the object-side surface S6 of the second lens L2 is convex at the near circumference, and the image-side surface S7 of the second lens L2 is concave at the near circumference; the object-side surface S8 of the third lens L3 is convex at the near circumference, the image-side surface S9 of the third lens L3 is concave at the near circumference, the object-side surface S10 of the fourth lens L4 is concave at the near circumference, and the image-side surface S11 of the fourth lens L4 is convex at the near circumference; the object-side surface S12 of the fifth lens L5 is concave at the near circumference, and the image-side surface S13 of the fifth lens L5 is convex at the near circumference; the object-side surface S14 of the sixth lens L6 is concave in the near-circumference direction, and the image-side surface S15 of the sixth lens L6 is convex in the near-circumference direction.

Referring to fig. 10, fig. 10 is a diagram illustrating a spherical aberration (mm), astigmatism (mm) and distortion (%) of the optical imaging system 10 according to the fifth embodiment, wherein the reference wavelengths of the focal length, abbe number and refractive index are 587.5618 nm. The optical imaging system 10 in the fifth embodiment satisfies the conditions of the following table.

Table 9

It should be noted that f is the focal length of the optical imaging system 10, FNO is the f-number of the optical imaging system 10, and FOV is the maximum field angle of the optical imaging system 10.

Table 10

The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all aspheric lenses. The aspherical surface has a surface shape determined by the following formula:

where Z is the longitudinal distance from any point on the aspherical surface to the surface vertex, r is the distance from any point on the aspherical surface to the optical axis, c is the vertex curvature (reciprocal of the radius of curvature), k is a conic constant, and Ai is a correction coefficient of the i-th order of the aspherical surface, and table 10 gives the high-order term coefficients K, A4, a6, a8, a10 … … that can be used for each of the spherical mirror surfaces S4-S15 in the fifth embodiment.

Sixth embodiment

Referring to fig. 11, the optical imaging system 10 of the present embodiment includes, from an object side to an image side, an isosceles right prism L0, a stop STO, a first lens L1 with positive bending force, a second lens L2 with positive bending force, a third lens L3 with negative bending force, a fourth lens L4 with positive bending force, a fifth lens L5 with positive bending force, a sixth lens L6 with negative bending force, and an infrared filter L7.

In the present embodiment, the object-side surface S4 of the first lens element L1 is convex at the paraxial region, and the image-side surface S5 of the first lens element L1 is concave at the paraxial region; the object-side surface S6 of the second lens element L2 is convex at the paraxial region, and the image-side surface S7 of the second lens element L2 is convex at the paraxial region; the object-side surface S8 of the third lens element L3 is convex at the paraxial region, the image-side surface S9 of the third lens element L3 is concave at the paraxial region, the object-side surface S10 of the fourth lens element L4 is convex at the paraxial region, and the image-side surface S11 of the fourth lens element L4 is concave at the paraxial region; the object-side surface S12 of the fifth lens element L5 is concave at the paraxial region, and the image-side surface S13 of the fifth lens element L5 is convex at the paraxial region; the object-side surface S14 of the sixth lens element L6 is concave at the paraxial region, and the image-side surface S15 of the sixth lens element L6 is convex at the paraxial region.

The object-side surface S4 of the first lens L1 is convex at the near circumference, and the image-side surface S5 of the first lens L1 is concave at the near circumference; the object-side surface S6 of the second lens L2 is convex at the near circumference, and the image-side surface S7 of the second lens L2 is convex at the near circumference; the object-side surface S8 of the third lens L3 is convex at the near circumference, the image-side surface S9 of the third lens L3 is concave at the near circumference, the object-side surface S10 of the fourth lens L4 is concave at the near circumference, and the image-side surface S11 of the fourth lens L4 is convex at the near circumference; the object-side surface S12 of the fifth lens L5 is concave at the near circumference, and the image-side surface S13 of the fifth lens L5 is convex at the near circumference; the object-side surface S14 of the sixth lens L6 is concave in the near-circumference direction, and the image-side surface S15 of the sixth lens L6 is convex in the near-circumference direction.

Referring to fig. 12, fig. 12 is a diagram illustrating a spherical aberration (mm), astigmatism (mm) and distortion (%) of the optical imaging system 10 according to the sixth embodiment, wherein the reference wavelengths of the focal length, abbe number and refractive index are 587.5618 nm. The optical imaging system 10 in the sixth embodiment satisfies the conditions of the following table.

Table 11

It should be noted that f is the focal length of the optical imaging system 10, FNO is the f-number of the optical imaging system 10, and FOV is the maximum field angle of the optical imaging system 10.

Table 12

The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all aspheric lenses. The aspherical surface has a surface shape determined by the following formula:

where Z is the longitudinal distance from any point on the aspherical surface to the surface vertex, r is the distance from any point on the aspherical surface to the optical axis, c is the vertex curvature (reciprocal of the radius of curvature), k is a conic constant, and Ai is a correction coefficient of the i-th order of the aspherical surface, and table 12 gives the high-order term coefficients K, A4, a6, a8, a10 … … that can be used for each of the spherical mirror surfaces S4-S15 in the sixth embodiment.

Seventh embodiment

Referring to fig. 13, the optical imaging system 10 in this embodiment includes, from the object side to the image side, an isosceles right prism L0, a stop STO, a first lens L1 with positive bending force, a second lens L2 with negative bending force, a third lens L3 with positive bending force, a fourth lens L4 with negative bending force, a fifth lens L5 with negative bending force, a sixth lens L6 with positive bending force, and an infrared filter L7.

In the present embodiment, the object-side surface S4 of the first lens element L1 is convex at the paraxial region, and the image-side surface S5 of the first lens element L1 is concave at the paraxial region; the object-side surface S6 of the second lens element L2 is convex at the paraxial region, and the image-side surface S7 of the second lens element L2 is concave at the paraxial region; the object-side surface S8 of the third lens element L3 is convex at the paraxial region, the image-side surface S9 of the third lens element L3 is concave at the paraxial region, the object-side surface S10 of the fourth lens element L4 is concave at the paraxial region, and the image-side surface S11 of the fourth lens element L4 is convex at the paraxial region; the object-side surface S12 of the fifth lens element L5 is concave at the paraxial region, and the image-side surface S13 of the fifth lens element L5 is convex at the paraxial region; the object-side surface S14 of the sixth lens element L6 is convex at the paraxial region, and the image-side surface S15 of the sixth lens element L6 is concave at the paraxial region.

The object-side surface S4 of the first lens L1 is convex at the near circumference, and the image-side surface S5 of the first lens L1 is concave at the near circumference; the object-side surface S6 of the second lens L2 is convex at the near circumference, and the image-side surface S7 of the second lens L2 is convex at the near circumference; the object-side surface S8 of the third lens L3 is convex at the near circumference, the image-side surface S9 of the third lens L3 is concave at the near circumference, the object-side surface S10 of the fourth lens L4 is concave at the near circumference, and the image-side surface S11 of the fourth lens L4 is convex at the near circumference; the object-side surface S12 of the fifth lens L5 is concave at the near circumference, and the image-side surface S13 of the fifth lens L5 is convex at the near circumference; the object-side surface S14 of the sixth lens L6 is concave in the near-circumference direction, and the image-side surface S15 of the sixth lens L6 is convex in the near-circumference direction.

Referring to fig. 14, fig. 14 shows a spherical aberration (mm), astigmatism (mm) and a distortion diagram (%) of the optical imaging system 10 according to the seventh embodiment, wherein the reference wavelengths of the focal length, the abbe number and the refractive index are 587.5618 nm. The optical imaging system 10 in the seventh embodiment satisfies the conditions of the following table.

Table 13

It should be noted that f is the focal length of the optical imaging system 10, FNO is the f-number of the optical imaging system 10, and FOV is the maximum field angle of the optical imaging system 10.

Table 14

The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all aspheric lenses. The aspherical surface has a surface shape determined by the following formula:

where Z is the longitudinal distance from any point on the aspherical surface to the surface vertex, r is the distance from any point on the aspherical surface to the optical axis, c is the vertex curvature (reciprocal of the radius of curvature), k is a conic constant, and Ai is a correction coefficient of the i-th order of the aspherical surface, and table 14 gives the high-order term coefficients K, A4, a6, a8, a10 … … that can be used for each of the spherical mirror surfaces S4-S15 in example seven.

Table 15 shows values of f × IMGH/Y62, EPD/Y62, Σ CT/T14, MVd/f, FOV/f, TL/f, f/f1, | SAG32|/CT34, | SAG41|/CT34, and mill 5/MAXL5 in the optical imaging systems 10 of the first to seventh embodiments.

Table 15

Referring to fig. 15, the optical imaging system 10 of the embodiment of the present invention can be applied to the image capturing device 100 of the embodiment of the present invention. The image capturing device 100 includes a photosensitive element 20 and the optical imaging system 10 of any of the embodiments. The photosensitive element 20 is disposed on the image side of the optical imaging system 10.

The photosensitive element 20 may be a Complementary Metal Oxide Semiconductor (CMOS) image sensor or a Charge-coupled Device (CCD).

Referring to fig. 15, the image capturing device 100 according to the embodiment of the present invention can be applied to the electronic device 1000 according to the embodiment of the present invention, in which the electronic device 1000 includes a housing 200 and the image capturing device 100, and the image capturing device 100 is installed in the housing 200 to obtain an image.

The utility model discloses on-vehicle, autopilot and monitoring device can be applied to electronic device 1000 of embodiment, wherein electronic device 1000 includes but is not limited to for vehicle event data recorder, smart mobile phone, panel computer, notebook computer, electron books read ware, Portable Multimedia Player (PMP), portable phone, videophone, digital still camera, mobile medical device, wearable equipment etc. support the electron device of formation of image.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims (12)

1. An optical imaging system, comprising, in order from an object side to an image side along an optical axis:

a prism;

a diaphragm;

a first lens having a positive refracting power, an object-side surface of the first lens being convex at a paraxial region;

a second lens having a bending force;

a third lens having a bending force;

a fourth lens having a bending force;

a fifth lens having a bending force; and

a sixth lens having a bending force;

the optical imaging system satisfies the following relation:

10mm≤f*IMGH/Y62≤25mm；

wherein f is an effective focal length of the optical imaging system, IMGH is a half of a maximum field angle corresponding image height of the optical imaging system, and Y62 is a maximum effective half aperture of an image side surface of the sixth lens.

2. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following relationship:

1≤EPD/Y62≤3；

and EPD is the diameter of an entrance pupil of the optical imaging system, and Y62 is the maximum effective half aperture of the image side surface of the sixth lens.

3. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:

1≤∑CT/T14≤2；

where Σ CT is the sum of thicknesses of all lenses of the optical imaging system on the optical axis, and T14 is the sum of thicknesses of the first lens, the second lens, the third lens, and the fourth lens on the optical axis.

4. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:

3mm^-1≤MVd/f≤6mm^-1；

wherein, MVd is the average value of Abbe numbers of the six lenses, and f is the effective focal length of the optical imaging system.

5. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:

1°/mm≤FOV/f≤6°/mm；

wherein FOV is the maximum field angle of the optical imaging system, and f is the effective focal length of the optical imaging system.

6. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:

0≤TL/f≤1；

wherein TL is a distance on an optical axis from an object-side surface of the first lens element to an image plane of the optical imaging system, and f is an effective focal length of the optical imaging system.

7. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:

1≤f/f1≤3；

wherein f is an effective focal length of the optical imaging system, and f1 is an effective focal length of the first lens.

8. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:

0≤|SAG32|/CT34≤1；

SAG32 is a displacement of the maximum effective radius position of the image-side surface of the third lens from the intersection point of the image-side surface of the third lens on the optical axis to the image-side surface of the third lens in the optical axis direction, and CT34 is a distance between the image-side surface of the third lens and the object-side surface of the fourth lens on the optical axis.

9. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:

0≤|SAG41|/CT34≤1；

SAG41 is a displacement of the maximum effective radius position of the object-side surface of the fourth lens from the intersection point of the object-side surface of the fourth lens on the optical axis to the object-side surface of the fourth lens in the optical axis direction, and CT34 is a distance between the image-side surface of the third lens and the object-side surface of the fourth lens on the optical axis.

10. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:

0≤MINL5/MAXL5≤1；

wherein MINL5 is the minimum thickness of the fifth lens in the effective area, and MAXL5 is the maximum thickness of the fifth lens in the effective area.

11. An image capturing apparatus, comprising:

the optical imaging system of any one of claims 1-10; and

and the photosensitive element is arranged on an imaging surface of the optical imaging system.

12. An electronic device, comprising:

a housing; and

the image capturing device as claimed in claim 11, mounted in the housing to capture an image.

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